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Benzene and its derivatives.

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Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Atomic Orbital

Region or volume in space in which the probability of finding electrons is highest.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Greenhouse Effect

Trapping of heat at the surface of the earth by carbon dioxide and water vapour in the atmosphere.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Group

A vertical column in the periodic table, also called a family.